According to the official MisFits book, Interspecies Transformation is the power to turn into an entirely different species.
- Bruno is the first character to have displayed this ability.
- Mark displayed this power after taking ecstasy, causing a reversal of his ability.
In Episode 5 (Series 2), it was revealed that Bruno's power of human mimicry, which he got from the Storm, was used to turn from his normal form (a gorilla) to human form due to his desire to be human. He used this power while forming an intimate relationship with Kelly.
In Episode 7 (Series 5), under the effects of ecstasy, Mark's power of permanent tortoise mimicry was reversed and he was transformed into a human, briefly.