Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Michelle Ryan
Table title:
Television
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Year </th><th colspan=1 rowspan=1 > Title </th><th colspan=1 rowspan=1 > Role </th><th colspan=1 rowspan=1 > Notes </th></tr>
<tr> <td colspan=1 rowspan=1 > 2000 </td><td colspan=1 rowspan=1 > The Worst Witch </td><td colspan=1 rowspan=1 > Dolores </td><td colspan=1 rowspan=1 > Episode: "Fair Is Foul & Fouls Are Fair" </td></tr>
<tr> <td colspan=1 rowspan=1 > 2000 </td><td colspan=1 rowspan=1 > Burnside </td><td colspan=1 rowspan=1 > School friend </td><td colspan=1 rowspan=1 > 2 episodes </td></tr>
<tr> <td colspan=1 rowspan=1 > 2000–05 </td><td colspan=1 rowspan=1 > EastEnders </td><td colspan=1 rowspan=1 > Zoe Slater </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 2003 </td><td colspan=1 rowspan=1 > EastEnders: Slaters in Detention </td><td colspan=1 rowspan=1 > Zoe Slater </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 2003 </td><td colspan=1 rowspan=1 > Comic Relief 2003: The Big Hair Do </td><td colspan=1 rowspan=1 > Zoe Slater </td><td colspan=1 rowspan=1 > Special </td></tr>
<tr> <td colspan=1 rowspan=1 > 2006 </td><td colspan=1 rowspan=1 > Agatha Christie's Marple </td><td colspan=1 rowspan=1 > Rose Water </td><td colspan=1 rowspan=1 > Episode: "By the Pricking of My Thumbs" </td></tr>
<tr> <td colspan=1 rowspan=1 > 2007 </td><td colspan=1 rowspan=1 > Comic Relief 2007: The Big One </td><td colspan=1 rowspan=1 > Kate </td><td colspan=1 rowspan=1 > Segment: "Mr. Bean's Wedding" </td></tr>
<tr> <td colspan=1 rowspan=1 > 2007 </td><td colspan=1 rowspan=1 > Mansfield Park </td><td colspan=1 rowspan=1 > Maria Bertram </td><td colspan=1 rowspan=1 > Movie </td></tr>
<tr> <td colspan=1 rowspan=1 > 2007 </td><td colspan=1 rowspan=1 > Jekyll </td><td colspan=1 rowspan=1 > Katherine Reimer </td><td colspan=1 rowspan=1 > 6 episodes </td></tr>
<tr> <td colspan=1 rowspan=1 > 2007 </td><td colspan=1 rowspan=1 > Bionic Woman </td><td colspan=1 rowspan=1 > Jaime Sommers </td><td colspan=1 rowspan=1 > 9 episodes </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 2008 </td><td class="highlighted"  colspan=1 rowspan=1 > Merlin </td><td class="highlighted"  colspan=1 rowspan=1 > Nimueh </td><td colspan=1 rowspan=1 > 4 episodes </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 2009 </td><td class="highlighted"  colspan=1 rowspan=1 > Doctor Who </td><td class="highlighted"  colspan=1 rowspan=1 > Lady Christina de Souza </td><td class="highlighted"  colspan=1 rowspan=1 > Episode: "Planet of the Dead" </td></tr>
<tr> <td colspan=1 rowspan=1 > 2009 </td><td colspan=1 rowspan=1 > Mr Eleven </td><td colspan=1 rowspan=1 > Saz Paley </td><td colspan=1 rowspan=1 > 2-part miniseries </td></tr>
<tr> <td colspan=1 rowspan=1 > 2013 </td><td colspan=1 rowspan=1 > Covert Affairs </td><td colspan=1 rowspan=1 > Helen Hanson / Teresa Hamilton </td><td colspan=1 rowspan=1 > 5 episodes in season 4 </td></tr>
<tr> <td colspan=1 rowspan=1 > 2014 </td><td colspan=1 rowspan=1 > Death in Paradise </td><td colspan=1 rowspan=1 > Lexi Cunningham </td><td colspan=1 rowspan=1 > Episode 3.2 </td></tr>
<tr> <td colspan=1 rowspan=1 > 2018 </td><td colspan=1 rowspan=1 > True Horror </td><td colspan=1 rowspan=1 > Vanessa Mitchell </td><td colspan=1 rowspan=1 > Episode: "The Witches' Prison" </td></tr>
</table>
Question:
What roles did Michelle Ryan have in 2008 and 2009?
Answer:
Michelle Ryan appeared as Nimueh in the 2008 Merlin, and as Lady Christina de Souza in the 2009 Doctor Who episode "Planet of the Dead".