Where can I watch Nickelodeon series such as The Thundermans in French?

If you have a newer TV , you can just use the SAP program to watch channels in other languages. Check your remote or your TV manual.

SAP is a secondary audio stream that a broadcaster may choose to transmit for television programs. This stream may include an audio track in another language (such as French or Spanish), and/or descriptive narration for the visually-impaired