Red Bloon Apopalypse is a Basic Powercard in Bloons Card Storm, introduced in version 3.0. It is similar to Red Bloon Storm, except it fills all empty slots in both the player's and the opponent's Bloon queues with Red Bloons instead of just the player's. Red Bloons fill one at a time at the player's side, and then again for the opponent's side.
Unlike the more common and cheaper Red Bloon Storm, Red Bloon Apopalypse is mostly meant to be used to summon Red Bloons on your opponent's side to block them from playing and prevent the Storm's Bloons. Friendly Red Bloons serve as a downside, however they are able to be played around.
Red Bloon Apopalypse plays entirely differently from Red Bloon Storm, and should be never used for swarm synergy. Instead, use it to block your opponent from Bloons.
Although the opponent's Reds may potentially pose a leaking threat, it takes two turns for them to leak, and your Reds can attack first. Regardless, the opponent's Reds are far less dangerous overall, compared to the opponent's own rushes.
Avoiding popping the Bloons spawned on the opponent's side has many practical benefits:
It prevents the opponent from playing any of their own Bloons for two turns, which gives more tempo for the user and stops aggro players (unless it's a swarm aggro deck that uses Bloon Embiggen, which benefits them instead). This can be combined with Glue Storm, Powerful Slowing Totem, and/or ARBITR to add more turns.
It can block the Storm from summoning more Bloons.
Weakening the opponent's Bloons without popping them (such as by using one Spike Storm), then allowing them to leak, is an easy way to scale Heart of Vengeance Druids.
Note that a player can use certain Hero abilities (mainly Quincy's Arrow Shot) or cards (e.g. Overload, Bloon Melter, Enhanced Reflexes) to open up space for another Bloon. Both players are able to take advantage of this to send better bloons for extra pressure. To prevent some of these, Bloontonium Leak can be used before Red Bloon Apopalypse.
Once the opponent's Red Bloons are destroyed, they fill the opponent's graveyard with Red Bloons, which makes Reinflated and The Prestige less likely to draw the Bloons the opponent wants (such as Pink Bloons and The Eternal).
Some decks that focus on the Extractor Bloon use Red Bloon Apopalypse with weak damage like Quincy's passive, Spike Storm, or Glaive Ricochet to feed the Extractor Bloon(s).
Red Bloon Apopalypse may also reduce chances for a successful Hastening Bloon on either side if the Reds are not 0 delay.
Spike-o-Pults can pop the opponent's Bloons to gain more Attack Power easily. Note that popping one of the opponent's Bloons right before the Storm summons a Bloon on their side will cause the Storm to fill the empty slot before the opponent can play their own Bloons, which allows the player to scale a Spike-o-Pult while still preventing the opponent from playing their own Bloons.
Unlike versus Red Bloon Storm, Spike Storm! should be primarily used to weaken the opponent's Reds without popping them. However, Spike Storm! is still useful in Extractor synergies.