It has been confirmed that the Androvax will be returning in the second story of S4 of The SJA's. The androvax was last seen in Prisoner of the Judoon, which was the first story in The Sarah Jane Adventures Series 3. A full character bio can be found HERE
It has also been speculated, though it is as yet unconfirmed, that S5 of The SJA's will contain a Silurian two parter. The Silurians were last seen in Doctor Who Series 5.