Conversation so far:
Who were the original three ninja turtles?
CANNOTANSWER.
What were the names of the Ninja Turtles?
Teenage Mutant Ninja Turtles.
Did they have a leader?
In The Secret of the Ooze, Leonardo was much more prominent and his leader position was brought to focus.
Who did he lead?
leader position in the team.

Question: Was Master Splinter there?
Self-contained rewrite: Was Master Splinter in The Secret of the Ooze?