Ursula can possibly be an orphan (2015 version)
Here's some theories.- It said she was born in a tribe who misplaced her. Maybe an animal tribe.
- Ape mentioned her being from another planet.
- If Season 3 was in production, there should be an Origin episode of Ursula, maybe she had parents, or possibly like George, next 2 or 3 years, came from the next orphan storm.
The second season is All Just a Dream that Season 1!George is having.
Hence the rather jarring changes in-between the 8-year hiatus. Alternatively to the above, Season 1 is All Just a Dream that Season 2!George is having.
The characters in Season 2 are robots
For those who don't know, Season 1 ended with an extra-long special episode "Escape From Madmun Island", in which George and company find themselves on an island identical to their own home, surrounded by robotic animals. The reason Season 2 is so different is because it takes place on another one of these islands and the characters are robot duplicates of the original cast with some liberties taken to their appearances and personalities. Everyone in the show is a Time Lord.
The Season 2 cast are their regenerations.